<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>其他常用样式</title>
<style>
	#box1{ width:200px; height:50px; background:red; }
	#box2{ width:200px; height:50px; background:green; 
		display:none;}
	#box3{ width:200px; height:50px; background:blue; }
</style>
</head>
<body>
<div id="box1"></div>
<div id="box2"></div>
<div id="box3"></div>
</body>
</html>




